Medical consultations were also taken into consideration, as PDE5 inhibitors require a valid prescription from a licensed medical provider. Sildenafil may not be safe to take for people with certain medical conditions including: a past history of stroke or heart attack in the last 6 months retinitis pigmentosa an eye disease It can also interact with many other medicines, particularly nitrates used in heart disease , amyl nitrite and blood pressure medicines. Shake the liquid well for 10 seconds before each use to mix the medication evenly. VIAGRA was administered to more than 3, patients aged 19 to 87 years, with ED of various etiologies organic, psychogenic, mixed with a mean duration of 5 years. Just be aware that medication ordered from outside the U. What side effects can this medication cause? Key facts It usually takes 30 to 60 minutes for sildenafil to work for erectile dysfunction.Roman’s consultations and follow-ups are free. Medication prices vary based on what your prescriber recommends, whether it’s a generic version, and how many pills you order per shipment. Generic Viagra (sildenafil): $4 per 25 mg pill, $6 per 50 mg pill, $10 per mg pill; Branded Viagra: $90 per 25 mg, 50 mg, or mg pill. India. Can i buy pills in istanbul. Or they inly sell full pack? Edited: 5 years ago. About sildenafil (Viagra) Sildenafil is a medicine used to treat erection problems (erectile dysfunction). Sildenafil is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). If you have erection problems sildenafil works by temporarily increasing blood flow to your penis when.